sc_bv_base.h

system C源码 一种替代verilog的语言

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  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2006 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License Version 2.4 (the "License");
  You may not use this file except in compliance with such restrictions and
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  ANY KIND, either express or implied. See the License for the specific
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/*****************************************************************************

  sc_bv_base.h -- Arbitrary size bit vector class.

  Original Author: Gene Bushuyev, Synopsys, Inc.

 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

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  Description of Modification:

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// $Log: sc_bv_base.h,v $
// Revision 1.1.1.1  2006/12/15 20:31:36  acg
// SystemC 2.2
//
// Revision 1.3  2006/01/13 18:53:53  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//

#ifndef SC_BV_BASE_H
#define SC_BV_BASE_H


#include "sysc/datatypes/bit/sc_bit_ids.h"
#include "sysc/datatypes/bit/sc_bit_proxies.h"
#include "sysc/datatypes/bit/sc_proxy.h"
#include "sysc/datatypes/int/sc_length_param.h"


namespace sc_dt
{

// classes defined in this module
class sc_bv_base;


// ----------------------------------------------------------------------------
//  CLASS : sc_bv_base
//
//  Arbitrary size bit vector base class.
// ----------------------------------------------------------------------------

class sc_bv_base
    : public sc_proxy<sc_bv_base>
{
    friend class sc_lv_base;


    void init( int length_, bool init_value = false );

    void assign_from_string( const std::string& );
  
public:

    // typedefs

    typedef sc_proxy<sc_bv_base> base_type;


    // constructors

    explicit sc_bv_base( int length_ = sc_length_param().len() )
	: m_len( 0 ), m_size( 0 ), m_data( 0 )
	{ init( length_ ); }

    explicit sc_bv_base( bool a,
			 int length_ = sc_length_param().len() )
	: m_len( 0 ), m_size( 0 ), m_data( 0 )
	{ init( length_, a ); }

    sc_bv_base( const char* a );

    sc_bv_base( const char* a, int length_ );

    template <class X>
    sc_bv_base( const sc_proxy<X>& a )
	: m_len( 0 ), m_size( 0 ), m_data( 0 )
	{ init( a.back_cast().length() ); base_type::assign_( a ); }

    sc_bv_base( const sc_bv_base& a );

#ifdef SC_DT_DEPRECATED

    explicit sc_bv_base( const sc_unsigned& a )
	: m_len( 0 ), m_size( 0 ), m_data( 0 )
	{ init( a.length() ); base_type::assign_( a ); }

    explicit sc_bv_base( const sc_signed& a )
	: m_len( 0 ), m_size( 0 ), m_data( 0 )
	{ init( a.length() ); base_type::assign_( a ); }

    explicit sc_bv_base( const sc_uint_base& a)
	: m_len( 0 ), m_size( 0 ), m_data( 0 )
	{ init( a.length() ); base_type::assign_( a ); }

    explicit sc_bv_base( const sc_int_base& a)
	: m_len( 0 ), m_size( 0 ), m_data( 0 )
	{ init( a.length() ); base_type::assign_( a ); }

#endif


    // destructor

    virtual ~sc_bv_base()
	{ if( m_data != 0 ) delete [] m_data; }


    // assignment operators

    template <class X>
    sc_bv_base& operator = ( const sc_proxy<X>& a )
	{ assign_p_( *this, a ); return *this; }

    sc_bv_base& operator = ( const sc_bv_base& a )
	{ assign_p_( *this, a ); return *this; }

    sc_bv_base& operator = ( const char* a );

    sc_bv_base& operator = ( const bool* a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( const sc_logic* a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( const sc_unsigned& a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( const sc_signed& a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( const sc_uint_base& a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( const sc_int_base& a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( unsigned long a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( long a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( unsigned int a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( int a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( uint64 a )
	{ base_type::assign_( a ); return *this; }

    sc_bv_base& operator = ( int64 a )
	{ base_type::assign_( a ); return *this; }


#if 0

    // bitwise complement

    sc_bv_base& b_not();

    const sc_bv_base operator ~ () const
	{ sc_bv_base a( *this ); return a.b_not(); }


    // bitwise left shift

    sc_bv_base& operator <<= ( int n );

    const sc_bv_base operator << ( int n ) const
	{ sc_bv_base a( *this ); return ( a <<= n ); }


    // bitwise right shift

    sc_bv_base& operator >>= ( int n );

    const sc_bv_base operator >> ( int n ) const
	{ sc_bv_base a( *this ); return ( a >>= n ); }


    // bitwise left rotate

    sc_bv_base& lrotate( int n );


    // bitwise right rotate

    sc_bv_base& rrotate( int n );

#endif


    // common methods

    int length() const
	{ return m_len; }

    int size() const
	{ return m_size; }

    sc_logic_value_t get_bit( int i ) const;
    void set_bit( int i, sc_logic_value_t value );

    sc_digit get_word( int i ) const
	{ return m_data[i]; }

    void set_word( int i, sc_digit w )
	{ m_data[i] = w; }

    sc_digit get_cword( int i ) const
	{ return SC_DIGIT_ZERO; }

    void set_cword( int i, sc_digit w );

    void clean_tail();


    // other methods

    bool is_01() const
	{ return true; }

protected:

    int     m_len;  // length in bits
    int     m_size; // size of data array
    sc_digit* m_data; // data array
};


// IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

#if 0

// bitwise left rotate

inline
const sc_bv_base
lrotate( const sc_bv_base& x, int n )
{
    sc_bv_base a( x );
    return a.lrotate( n );
}


// bitwise right rotate

inline
const sc_bv_base
rrotate( const sc_bv_base& x, int n )
{
    sc_bv_base a( x );
    return a.rrotate( n );
}

#endif


// common methods

inline
sc_logic_value_t
sc_bv_base::get_bit( int i ) const
{
    int wi = i / SC_DIGIT_SIZE;
    int bi = i % SC_DIGIT_SIZE;
    return sc_logic_value_t( m_data[wi] >> bi & SC_DIGIT_ONE );
}

inline
void
sc_bv_base::set_bit( int i, sc_logic_value_t value )
{
    int wi = i / SC_DIGIT_SIZE;
    int bi = i % SC_DIGIT_SIZE;
    sc_digit mask = SC_DIGIT_ONE << bi;
    m_data[wi] |= mask; // set bit to 1
    m_data[wi] &= value << bi | ~mask;
}


inline
void
sc_bv_base::set_cword( int i, sc_digit w )
{
    if( w ) {
	SC_REPORT_WARNING( sc_core::SC_ID_SC_BV_CANNOT_CONTAIN_X_AND_Z_, 0 );
    }
}


inline
void
sc_bv_base::clean_tail()
{
    int wi = m_size - 1;
    int bi = m_len % SC_DIGIT_SIZE;
	if ( bi != 0 ) m_data[wi] &= ~SC_DIGIT_ZERO >> (SC_DIGIT_SIZE - bi);
}

} // namespace sc_dt


#endif